A regression model is desired relating temperature and the proportion of impurities passing through solid helium.

Temperature is listed in degrees centigrade. The data are as follows:

1. Fit a linear regression model.

0 1 2. Does it appear that the proportion of impurities passing through helium increases as the temperature approaches –

273 degrees centigrade?

3. Find R .

4. Based on the information above, does the linear model seem appropriate? What additional information would you need to better answer that question?